There is nothing worse than being cheated. Now body language expert Judi James tells you the key signs to find out whether someone is telling a lie. Here are some ways to help you.
The long stop: Telling a lie is quite difficult for the body and brain to deal with. First your brain produces the truth. Then, you have to hide the truth and invent a lie. After that, you tell the lie. This often leads to a longer stop before answering.
The eye dart: Humans have more eye expressions than any other animal and our eyes can look around if we're trying to hide something. When we look up to our left, we're often recalling memory. But when our eyes roll up to our right, we are thinking new ideas. Also, the guilt(内疚)of a lie often makes people use an eye contact cut-off gesture, such as looking down or away.
The lost breath: Bending the truth causes a sudden stress response in most people. The mouth dries, the body sweats more, the pulse rate (心率) becomes quick and the rhythm of the breathing changes to shorter, shallower breaths that can often be both seen and heard.
The poker face: Some people prefer to have the poker face, because they think less is more and almost show less movement and eye contact when they are telling lies.
The
face hide: When someone tells a lie they often want to hide their face from
their audience. 
This can lead to a cut-off gesture like nose-touch or mouth-cover.
Self-comfort touches: People often move from side to side, touch their hair or play with wedding rings when they have stress. Most people use self-comfort gestures but this will increase greatly when someone is lying.
